There are different operation times for different types of diseases, because the operation time of each operation needs to depend on the complexity of this operation, for example, a simpler one, doing a laparoscopic appendectomy, may be relatively simple and can be completed in 15-20 minutes. If a gastrointestinal tumor is done, it usually takes 2-3 hours, and if you are skilled, it may be faster. For more difficult surgeries like pancreaticoduodenal cholecystectomy, it takes longer. The time required for different surgeries varies, and it is up to the doctor to determine the treatment plan for this surgery before deciding how long the operation will take.